CVE-2025-59969

/// Technical description

A Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in the advanced forwarding toolkit (evo-aftmand/evo-pfemand) of Juniper Networks Junos OS Evolved on PTX Series or QFX5000 Series allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).An attacker sending crafted multicast packets will cause line cards running evo-aftmand/evo-pfemand to crash and restart or non-line card devices to crash and restart. Continued receipt and processing of these packets will sustain the Denial of Service (DoS) condition.

This issue affects Junos OS Evolved PTX Series:

* All versions before 22.4R3-S8-EVO,

* from 23.2 before 23.2R2-S5-EVO,

* from 23.4 before 23.4R2-EVO,

* from 24.2 before 24.2R2-EVO,

* from 24.4 before 24.4R2-EVO.

This issue affects Junos OS Evolved on QFX5000 Series:

* 22.2-EVO version before 22.2R3-S7-EVO,

* 22.4-EVO version before 22.4R3-S7-EVO,

* 23.2-EVO versions before 23.2R2-S4-EVO,

* 23

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References